The 22 Cheetah was developed by Jim Carmichel, shooting editor of Outdoor Life magazine and Fred Huntington of RCBS fame. It appears to have originated in the late 1970's. The cartridge is essentially a full length Remington 308 BR case, with a smaller primer pocket, necked down to 22 caliber, but with the shoulder moved forward. What you end up with is a variation of the 308 Winchester necked down to 22, but using a special match case. This is not exactly new because there are in existence several slightly different versions made by necking the 243 Winchester case down, and these date back to the early 1960's. However, the 22 Cheetah is an original with regard to the 308 BR case and its smaller rifle primer pocket.
The major difference between the 22 Cheetah and its predecessors are the use of the lighter, more uniform BR case, blown out 40 degree shoulder angle and short neck. In other words, the case has been designed to benchrest specifications. It also has a greater powder capacity than any of the older versions. There are actually two case types, the MKI with a 40 degree shoulder angle and the MKII with the original 28 degree shoulder. The 22 Cheetah is somewhat more powerful than the 220 Swift, but ballistics were measured from a 27 inch barrel. The cartridge has proven to be superbly accurate and a very effective 300 yard varmint cartridge
Hi-jacked this off the web, hope it answers your questions. [img]images/icons/smile.gif[/img]
Thanks, VH. That's about what I thought. I'll bet it's a barrel burner.
Necking the case down from 30 cal seems like a serious operation, probably in several stages with maybe more than one neck-turning. For us ordinary people, maybe it would be easiest to form cases from a 243, using the shoulder left on the neck for initial headspacing.
Not a barrel burner if cleaned properly. Must push a brush through after every ten shots. Carmichael and Huntington took on the challenge to devise the fastest most accurate cartridge they could. The result the .22 Cheetah Mk I. They did not shoot out the barrel on they're creation. There are six forming steps with the last being a fire forming. I have been shooting mine for 20 yrs. I use a Remington 52 gr. Hollow Point Flat Based bullet. Behind it is 43 1/2 grs of 4064 IMR Powder. The cases are the .308 Remington Bench Rest Cases with the small Primer hole. It's a life taker. A meat gun. Chrono'd at 4480 fps. Way more beefy that the Bee's. Get it going you wont be sorry.....
If you want to get back to more or less the original version of the 22 CHeetah, there's always the new Lapua 308 Palma cases. Match spec, and are produced with the small primer pockets just like the original Remington 308 UBR cases Jim used in developing this cartridge.
Incidentally, the case is normally designated as the 22 CHeetah, with the C and H both being capitalized; they denote the two developers, Carmichael and Huntington. Neat round, and a high powered performer if there ever was one.